package com.beauty.util;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

public class HttpUtil {
	
	/**
	 * 
	 * @Title: isAjaxRequest
	 * @Description: TODO(这里用一句话描述这个方法的作用)
	 * @author frinder_liu
	 * @param request
	 * @return
	 * @return boolean
	 * @date 2015年5月24日 下午9:13:29
	 * @throws
	 */
	public static boolean isAjaxRequest(HttpServletRequest request) {
		String ajaxKey = String.valueOf(request.getHeader("X-Requested-With")).toUpperCase();
		return "XMLHttpRequest".toUpperCase().equals(ajaxKey);
	}

	/**
	 * 获得get请求参数
	 * 
	 * @param params
	 * @return
	 */
	public static String getParam(Map<String, String> params) {
		String param = "?";
		if (params == null) {
			return "";
		}
		int i = 0;
		// 参数
		for (Map.Entry<String, String> entry : params.entrySet()) {
			if (i == 0) {
				param = entry.getKey() + "=" + entry.getValue();
				++i;
			} else {
				param = "&" + entry.getKey() + "=" + entry.getValue();
			}
		}
		if ("?".equals(param)) {
			return "";
		}
		return param;
	}

	/**
	 * 向指定URL发送GET方法的请求
	 * 
	 * @param url
	 *            发送请求的URL
	 * @param param
	 *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
	 * @return URL 所代表远程资源的响应结果
	 */
	public static String sendGet(String url, Map<String, String> params) {
		String result = "";
		// 获取参数
		String param = getParam(params);

		BufferedReader in = null;
		try {
			String urlNameString = url + param;
			URL realUrl = new URL(urlNameString);
			// 打开和url之间的连接
			URLConnection connection = realUrl.openConnection();
			// 设置通用请求属性
			connection.setRequestProperty("accept", "*/*");
			connection.setRequestProperty("connection", "Keep-Alive");
			connection.setRequestProperty("user-agent",
					"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
			// 建立实际连接
			connection.connect();
			// 获取所有响应头字段
			Map<String, List<String>> map = connection.getHeaderFields();
			// 遍历所有响应
			for (String key : map.keySet()) {
				System.out.println(key + "---->" + map.get(key));
			}
			// 定义BufferdReader输入流读取url响应
			in = new BufferedReader(new InputStreamReader(
					connection.getInputStream()));
			String line;
			while ((line = in.readLine()) != null) {
				result += line;
			}

		} catch (Exception e) {
			System.out.println("发送Get请求异常\n" + e);
			// e.printStackTrace();
		} finally {
			try {
				if (in != null) {
					in.close();
				}
			} catch (Exception e2) {
				e2.printStackTrace();
			}
		}
		return result;
	}

	/**
	 * 向指定 URL 发送POST方法的请求
	 * 
	 * @param url
	 *            发送请求的 URL
	 * @param param
	 *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
	 * @return 所代表远程资源的响应结果
	 */
	public static String sendPost(String url, String param) {
		PrintWriter out = null;
		BufferedReader in = null;
		String result = "";
		try {
			URL realUrl = new URL(url);
			// 打开和url之间的连接
			URLConnection connection = realUrl.openConnection();
			// 设置通用请求属性
			connection.setRequestProperty("accept", "*/*");
			connection.setRequestProperty("connection", "Keep-Alive");
			connection.setRequestProperty("user-agent",
					"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
			// connection.setRequestProperty("Content-Type",
			// "text/xml; charset=UTF-8 ");
			connection.setRequestProperty("Content-Type",
					"application/json; charset=UTF-8 ");

			// 发送post必须设置
			connection.setDoInput(true);
			connection.setDoOutput(true);
			
			// 获取URLConnection对象对应的输出流
			out = new PrintWriter(connection.getOutputStream());
			// 发送请求参数
			out.print(param);
			// flush输出流缓冲
			out.flush();
			// 定义BufferedReader输入流读取响应
			in = new BufferedReader(new InputStreamReader(
					connection.getInputStream()));
			String line;
			while ((line = in.readLine()) != null) {
				result += line;
			}
		} catch (Exception e) {
			System.out.println("发送post请求异常\n" + e);
			// e.printStackTrace();
		} finally {
			try {
				if (in != null) {
					in.close();
				}
				if (out != null) {
					out.close();
				}
			} catch (Exception e2) {
				e2.printStackTrace();
			}
		}
		return result;

	}

}
